North American Philips Corporation

Kris Aelterman

Jagannathan Ravi

Kathleen P Bernard

Kent L Collins

John P Dunn

John C Alderman

Jay J Palmer

Kenneth E Pearson

Dale E Brabham

Ronald C Marburger

Herbert Bayne

Two series connected high pressure sodium arc discharge tubes include a saturated arc tube and an unsaturated arc tube. When the saturated arc tube voltage shifts in value due to changes in operating conditions, the other unsaturated arc tube voltage does not shift to compensate for the voltage increase. Because the unsaturated arc tube voltage does not shift, the rate of voltage shift of the saturated arc tube is smaller in magnitude than otherwise would occur if both arc tubes were saturated.

High pressure discharge lamp utilizing an unsaturated type discharge tube

A 1000 watt arc discharge arc tube assembly comprises two series connected side-by-side arc discharge tubes whose combined break down voltage in sufficient for a standard 2-5 kv starting pulse to simultaneously start both arc tubes without additional structure. A standard ballast, starter and fixture can be used with the arc tube assembly whose overall length is less than 300 millimeters. The lamps are spaced sufficiently apart to preclude detrimental heat transfer effects on one another and sufficiently close to act as a single source of light in standard fixtures normally employing lamps having a single discharge tube.

High-pressure series arc discharge lamp construction

A discontinuous annular metallic holder for a glow starter in a high pressure discharge lamp. The holder has a hexagonal shape and encircles the bulb of the glow starter. One side is welded to one of the current-supply conductors extending from the lamp stem and two of the sides are parallel to the plane of the getters. The lower parallel side closest to the getter plane has an opening extending the length of the side to define an electrical discontinuity and to prevent a continuous circuit path within the lower side. The gap reduces the current induced in the lower side and resultant heating when the holder is subjected to an electromagnetic field during flashing of the getters. The reduced temperature of the lower side prevents damage to the glow starter.

Glow starter holder with protection against R.F. overheating

Growing community of inventors

Hoboken, Belgium

Kris Aelterman